condition mean min max ZT0-3 9.21523 9.21523 9.21523 ZT4-7 8.762910000000002 8.762910000000002 8.762910000000002 ZT8-11 8.139545 8.139545 8.139545 ZT12-15 9.009795 9.009795 9.009795 ZT16-19 16.4854 16.4854 16.4854 ZT20-23 9.871794999999999 9.871794999999999 9.871794999999999